Chock and starter for molding machines



Nov. 19, 1929. F. R. WALLACE 1,736,513

CHOCK AND STARTER FOR MOLDING MACHINES Filed June 21, 1928 2 Sheets-Sheet l Nov. 19, 1929.

F. R. WALLACE CHOGK AND STARTER FOR MOLDING MACHINES Filed June 21, 1928 2 Sheets-Sheet '2 "Ill-11H min-vs Patented Nov. 19, 1929 PATENT vF-FiCE mun-WNW- FRANK R. WALLACE, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE TABOR MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA onoox AND STARTER Fon- MOLDING MACHINES Application filed June 21,

The present invention is intended for application to molding machines in which a flask receiving means is mounted upon a truck or car which, traveling on the rails of a tramway, run into and out of the molding machine and is utilized to hold and support the flask during the pattern drawing operation. It is essential that the truck remain at rest during the pattern drawing operation in order to insure perfect molds or half molds.

It is the principal objectof the present invention to provide simple, reliable and efficient chock mechanism for automatically on and firmly holding the truck in position in the machine and for, upon manual release, starting the truck out of the machine by the action of a spring previously compressed in arresting the incoming movement of the car or truck.

Generally stated, the invention may be said to comprise a rocking shoe having a shank and of which one end is always above the rail of the tramway and of which the other end is adapted to move above and below the same,a stop for the shoe when its last named end is below the rail, an extension spring coupling pivotally anchored at one end and pivotally connected at the other end to said extension and adapted to normally turn said shoe up to its stop, a pivotal lever having a catch for automatically engaging said extension and for releasing the same, and a spring for said lever. V

The invention also comprises the improvements to be presently described and finally claimed.

In the following description reference will be made to the accompanying drawings forming part hereof and in which Figure 1 is a side View of a chock and starter embodying features of the invention showing in dotted lines and in full lines two positions of the shoe and also showing a wheel of a tram car.

Fig. 2 is an end View looking from left to right in F 1 and showing the rail of the tramway in section.

Referring to the drawings 1 is a rocking shoe adapted in the position shown in full lines in Fig. 1 to present both of its ends 2 19528. Serial No. 287,323.

and 3 above the rail indicated by the line 4 in Fig. 1 and in position for engagement with the wheel flange 5. The rocking shoe in the position shown in dotted lines presents the end 2 below the rail and the end 3 above the rail in position for engagement with a wheel flange traveling from right to left in Fig. 1. 6 is stop and 7 is a spring arranged to urge the end 2 of the shoe into contact with the stop and into the position shown by dotted lines, andthe spring operates to start the car, of'the tramway from left to right in Fig. 1. The shoe is shown as rocking about the pivot 8" provided on a base 8, and. the sprin is shown in the form of an extension spring coupling of which the end 9 is pivoted to the base by a pivot 10, and of which the end 11 is pivoted to an extension 12 provided on the shoe. There is a hand lever 13 pivoted at 10 and having a catch 14: for engagingthe extension 12 and for releasing the same. As shown the catch 14 engages the pin 15 projecting from the extension 12, andthis pin 15 also serves for pivotal connection with. the endll of the coupling.

16is a spring connected with the hand lever 13 and with the base 8, and its purpose is to 'yieldably hold the lever up to the extension '12, or more accurately, up to the pin 15 projectirig from the extension 12.

The mode of operation may be described as follows 2 Assuming the shoe to bein the position shown in dotted lines, the pin 15 is clear of the catch 14, and the hand lever is turned toward theright from the position that it occopies in Fig. 1 under the action of the spring 16, so that it rides upon the pin 15, butthe catch lt is well'below the pin 15. The parts are not shown in that position because it would confuse the drawings and because it is believedthat the matter willbe readily understood from the foregoing description. VVhenthe truck is pushed into the molding machine in whichthe chock and starter are arranged, the flange 5 of the oncoming wheel rides aboveand past the end 2 of the shoe but strikes the end 3 of the shoe and turns the shoe into the position shown by full lines, compressing the spring 7'. This movement of the shoe brings the pin 15 under the catch let which automatically locks the shoe and wheel so that the latter is immovable while a pattern is drawn. Reference has been made to the ends of the shoe but some might describe the parts referred to as pads. Upon completion of the pattern drawing operation the operator pulls the handle 13 toward the left thus disenga ing the catch from the pin 15. The spring 4 elongates the spring coupling turning the shoe into dotted line position against its stop 6 and starting the car out of the molding machine. The spring 16 causes the hand lever to follow the pin 15 into position for ire-engaging it.

It will be obvious to those skilled in the art to which the invention relates that modifications may be made in details of construction and arrangement and matters of mere form without departing from the spirit of the invention which is not limited to such matters or otherwise than the prior art and the appended claims may require.

I claim:

1. A chock and starter for molding machine tramways including, in combination, a rocking shoe adapted in one position to present both its ends above the rail and in position for engagement with the wheel flange of a tramway and adapted in the other position to present one end below the rail and the other end above the rail in position for engagement with the wheel flange, a stop and a spring arranged to urge the shoe into contact with the Stop and into the last named position to start the car of the tramway, and a spring catch adapted to automatically lock the shoe when turned into the first mentioned position by the wheel flange of an oncoming tram car and to release the shoe for spring action in starting the car.

2. A chock and starter for molding machine tramways comprising, in combination, a rocking shoe having a shank and or" which one end is always above the rail and of which the other end is adapted to move above and below the same, a stop for the shoe when its last named end is below the rail, an extension spring coupling pivotally anchored at one end and pivotally connected at the other end to said shoe and adapted to turn said shoe up to its stop, a pivotal lever having a catch for automatically engaging said extension and for releasing the same, and a spring for said lever.

3. A chock and starter for molding machine tramways comprising, in combination a rocking shoe having a shank and of which one end is always above the rail and of which the other end is adapted to move above and below the same, a stop for the shoe when its last named end is below the rail, an extension spring coupling pivotally anchored at one end and pivotally connected at the other end to said shoe and adapted to turn said shoe up to its stop, a lever pivoted concentrically with said coupling and having a catch for automatically engaging said extension and for releasing the same, and a spring for said lever.

FRANK R. WALLACE. 

